Batteries

In the experiments you use two different types of batteries, one 9 Volt battery and a 1.5 Volt AA battery.

On the packaging or on the battery itself are usually two pieces of information...

• the voltage indicated in V (Volt) and
• the capacity indicated in mAh (milli-ampere-hour)

You get back to this information in the course of the experiments...

9 Volt Battery

Details of a typical 9 V rechargeable NiMH battery. (Enlarge)

Circuit symbol 9 V battery.

• Voltage: 9 V (alkaline battery), 8.4 V (rechargeable NiMH battery).
• Capacity: ca. 500 mAh (alkaline battery), ca. 200 mAh (rechargeable NiMH battery).

1.5 Volt AA Battery

Details of a typical 1.5 V AA rechargeable NiMH battery. (Enlarge)

Circuit symbol 1.5 V battery.

• Voltage: 1.5 V (alkaline battery), 1.2 V (rechargeable NiMH battery).
• Capacity: ca. 3000 mAh (alkaline battery), ca. 2000 mAh (rechargeable NiMH battery).

Measured Voltages In the description of experiments it is always assumed that a battery has either 1.5 V or 9 V. You certainly measure different values. This depends, among other things, on the type of battery and its state of charge. Therefore, note down your own measurements!